The number 42018
42018 is a composite number with 16 divisors. Its prime factorisation is 2 × 3 × 47 × 149. Divisors (16): 1, 2, 3, 6, 47, 94, 141, 149, 282, 298, 447, 894, 7003, 14006, 21009, 42018.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42018 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42018 is composite. Its prime factorisation is
- 3
The divisors add up to 86400; without 42018 itself that is 44382, so 42018 is abundant (44382 is more than 42018). Euler's totient φ(42018) = 13616 numbers up to 42018 share no factor with it.
- 4
The digits of 42018 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 31 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42018 = 2 \times 3 \times 47 \times 149 \]
42018 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 86400 |
| Euler totient φ(n) | 13616 |
| Square | 1765512324 |
| Cube | 74183296829832 |
| Square root | 204.982926 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 31 |
| Scientific notation | 4.2018 × |
42018 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand and eighteen |
| Binary (base 2) | 1010010000100010 |
| Octal (base 8) | 122042 |
| Hexadecimal (base 16) | A422 |
| Base 3 | 2010122020 |
| As time | 42018 seconds = 11 h 40 min 18 s |
Is 42018 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42018 ÷ 2 = 21009) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (42018 ÷ 3 = 14006) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (42018 ÷ 6 = 7003) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 6) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42018 a prime number?
No. 42018 = 2 × 3 × 47 × 149, so it is divisible by 2.
What are the factors of 42018?
1, 2, 3, 6, 47, 94, 141, 149, 282, 298, 447, 894, 7003, 14006, 21009, 42018.
What is 42018 in binary?
1010010000100010 (hexadecimal A422, octal 122042).
What is the square root of 42018?
About 204.9829.
Is 42018 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 42018?
It is a composite number with 16 divisors.